Hello i get this error
Someone has already registered this as an account SSH key.
when i will add the ssh-key on a other repository, thank you to help me and excuse me i was a beginning on english.
If you have already added your SSH key into your Bitbucket account Setting > Security > Access Key , it is not possible to add the same SSH key into the project or repository.
If your user has the Read or Write access permission to those repository, there is no need to add Access Key (SSH key) to those repositories.